ardevsha / tudo

A simple to-do app

tudo is an experiment on simple, private, synchronized to-do lists.

It is a useful demonstration of the realtime, offline-first capabilities powering the StoryArk app.

Try it out

The server part of this project can be found here: server.

Features

• Anonymous
  No mandatory user accounts or tracking of any sort.

• Shareable
  Lists can be shared between your devices or trusted contacts simply using the list id.

• Real-time
  Changes to lists propagate immediately to every connected device where the app is open and online.

• Private
  Each to-do list has a random unique identifier that is effectively impossible to guess.

• Offline-first
  No loading screens. The app stores all the data it needs locally and works perfectly without a connection.

• Multiplatform
  Mobile apps for Android and iOS, and more to come.

• Open-source
  Look at how it's built. Modify it. Host it yourself. Maybe help me improve it?

How it works

To do lists are stored on the device as CRDTs which enable conflictless synchronization with an essentially unlimited number of devices. Every device maintains a local copy of the entire database.

A live websocket connection to the server is kept open whenever the app is active and network is available. Local changes are immediately pushed to the network, and remote changes are pulled in real-time. This promotes rapid consistency of the database between all active devices in the network, and allows users to immediately see those changes in the interface.

The clients are built using Flutter, which makes it possible to build applications for all popular platforms from a single shared codebase.

How to contribute

Please file feature requests and bugs at the issue tracker.